centre of gravity

World English Dictionary
centre of gravity
 
n
the point through which the resultant of the gravitational forces on a body always acts

Collins English Dictionary - Complete & Unabridged 10th Edition
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WordNet
centre of gravity

noun
the point within something at which gravity can be considered to act; in uniform gravity it is equal to the center of mass [syn: center of gravity
WordNet® 3.0, © 2006 by Princeton University.
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